/*
 * Flashlib - QB9 common Flash library
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


package com.qb9.flashlib.tasks
{
	/**
	 * A set of tasks that will run in parallel.
	 *
	 * <p>When the Parallel task is started, all contained tasks are started
	 * at once.</p>
	 *
	 * @see TaskRunner
	 */
	public class Parallel extends TaskContainer
	{
		/**
		 * Create a Parallel task.
		 *
		 * <p>This constructor accepts either an array of ITask objects, or all the
		 * ITasks directly as the function arguments.</p>
		 */
		public function Parallel(... args)
		{
			super(true, args);
		}
		
		/** @inheritDoc */
		public override function clone():ITask
		{
			return new Parallel(cloneSubtasks());
		}

		/** @inheritDoc */
		public override function start():void
		{
			super.start();
			checkComplete();
		}

		protected function checkComplete():void
		{
			if (this.subtasks.length == 0)
				this.taskComplete();
		}

		protected override function onSubTaskComplete(ev:TaskEvent):void
		{
			super.onSubTaskComplete(ev);
			checkComplete();
		}
	}
}

